好氧颗粒污泥降解氯苯胺类化合物的作用模式

好氧颗粒污泥能有效降解氯苯胺类化合物,然而,其同步高效降解的性能和基质间作用模式尚不清楚。文章考察好氧颗粒污泥体系降解和矿化氯苯胺类化合物的性能,并深入探讨同步降解过程中,各基质间的促进或抑制效应。实验结果表明,该体系降解单一氯苯胺类化合物遵循合Luong动力学模型,邻氯苯胺(2-CA)、间氯苯胺(3-CA)、对氯苯胺(4-CA)最大降解浓度(Sm)分别为:678.1 mg/L,837.7 mg//L和819.8 mg/L;好氧颗粒污泥体系能够完全降解和矿化总浓度低于750 mg/L的氯苯胺混合物,各化合物间降解速率符合3-CA>4-CA>2-CA。当氯苯胺类化合物共存时,相互间存在竞争性抑制作用,其中,2-CA对3-CA和4-CA的抑制作用明显小于后两者混合的相互抑制作用;对于2-CA的生物降解,3-CA的抑制作用小于4-CA。

Substrate Interaction During Aerobic Granular Sludge Degradation of Chloroaniline

Aerobic granular sludge could remove chloroanilines(CAs) as the sole source of carbon and nitrogen effectively.However,relatively little was known about simultaneous degradation performance and substrate interaction.In the present work,the removal and mineralization of CA compounds were investigated,and inhibition or enhancing effects between CA compounds were further discussed.The experimental results indicated that the degrading process of the chloroaniline biodegradation followed the Luong model.Analysis of the kinetic parameters indicated that the maximum substrate concentration(Sm) of 2-CA,3-CA and 4-CA was estimated to be 678.5 mg/L,837.7 mg/L,819.8 mg/L,respectively.The aerobic granular sludge could degrade and mineralize CA mixture as high as 750 mg/L.The competitive inhibition interaction existed when the CA components were presented as a mixture.The presence of 2-CA slightly inhibited 3-CA and 4-CA degradation,while the interaction between 3-CA and 4-CA was more significant;In contrast,4-CA inhibited 2-CA degradation more strongly than 3-CA.